linux-kernel - Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional ttyS names

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Message-ID: <4790EB95.203@zytor.com>
Date:	Fri, 18 Jan 2008 13:10:29 -0500
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rene Herman <rene.herman@...access.nl>
CC:	7eggert@....de, Bjorn Helgaas <bjorn.helgaas@...com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Russell King <rmk+serial@....linux.org.uk>,
	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [patch 2/2] 8250_pnp: register x86 COM ports at the conventional
 ttyS names

Rene Herman wrote:
> 
> The number of places expected to contain something sensible should I 
> believe first be verified at 0x410 -- the equipment word. Bits 11-9 
> (0x0e00) should be the number of serial ports, 0 to 4 (so 5-7 is also a 
> sanity check) and if BIOSes can be expected to zero out the non-used 
> base-addresses (at 0x400, 0x402, 0x404, 0x406) that's another sanity 
> check. Don't know if they can though...
> 

Probably not.  However, the ports marked valid should be nonzero and 
aligned-8.

	-hpa

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